Investigation: a review of the device history record (dhr) for this unit showed no irregularities during manufacturing that were relevant to this issue.The values provided, along with the extra-corporeal volume (ecv) of the disposable set, were used to calculate the intended fluid balance (fb) versus the actual fb of the patient at the conclusion of the procedure.The intended fb was calculated to be total blood volume (tbv) 5188ml.Considering the original tbv of 4019ml, the total fb is 129% of the original tbv.The actual fb was also calculated using the 680ml of collected product.This equals an actual tbv of 4726ml and 117% of the original tbv.The difference between the two fb values is greater than the tolerances of the pumps.Root cause: a definitive cause for the overall product volume could not be determined.The service call did not reveal any abnormalities with the machine and the disposable set was unavailable for further analysis.Possible causes include, but are not limited to, a partial occlusion in the tubing set or tubing not fully set in the pump raceway.
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